Kavli Affiliate: Misao Sasaki
| First 5 Authors: Kaloian D. Lozanov, Shi Pi, Misao Sasaki, Volodymyr Takhistov, Ao Wang
| Summary:
Formation of cosmological solitons is generically accompanied by production
of gravitational waves (GWs), with a universal GW background expected at
frequency scales below that of non-linear dynamics. Beginning with a general
phenomenological description of GWs associated with soliton formation, we
demonstrate that universal GW background from axion-like particle (ALP)
solitonic oscillons provides a viable interpretation to the recent NANOGrav 15
year pulsar timing array data, which does not suffer from the overproduction of
primordial black holes. We show that pulsar timing array data displays
preference for models where formed solitons do not strongly interact or
cluster. Coincidence observations with Nancy Roman telescope will allow to
discriminate between distinct scenarios of cosmological solitons.
| Search Query: ArXiv Query: search_query=au:”Misao Sasaki”&id_list=&start=0&max_results=3